package cn.edu.scau.cmi.chenxiaoqin.exercise5;

public class Circle {
	double radius,area;
	Circle()
	{}
	Circle(double r)
	{
		radius = r;
	}
	void setRadius(double r)
	{
		if(r>0)
		{
			radius = r;
		}
	}
	double getRadius()
	{
		return radius;
	}
	double getArea()
	{
		area=3.14*radius*radius;
		return area;
	}
}
